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I have a project jeep I am struggling to figure out. It is backfiring when I get to a high RPM and am assuming I have a problem with my air fuel mixture. It is a TBI (fuel injected), any ideas on how I adjust the air fuel mixture?

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  • Cars & Trucks Master
  • 2,431 Answers

Back fire at a higher RPM?you need to look at the distributor,the internal part, the reluctor may have shifted causing the TBI to fire before the intake,

Posted on Nov 08, 2012

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Posted on Jan 02, 2017

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SOURCE: jeep wrangler stalls out

check idle air control, tps & map sensor. As usual with electronics, test test test before buying anything/

Posted on Feb 18, 2009

ourhowse
  • 2007 Answers

SOURCE: engine starts,reaches high rpm,then slowly returns

Vacuum leaks. Check all hoses and intake bolts. Leaking EGR or plugged PCV valve. Air filter plugged. Leaking head gasket. Worn timing chain. Camshaft lobes worn. Valves burned or leaking. Fuel idle control system or sensor. Good luck!

Posted on Jul 03, 2009

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Posted on Jul 13, 2009

polarcycle
  • 1392 Answers

SOURCE: need diagram of fuel injection for 85 4x4 22re

Sounds like you have a vacuum leak somewhere. There may be a stop adjustment on the throttle body, but usually high idles are due to unmetered air entering the system.

Posted on Jul 14, 2009

  • 432 Answers

SOURCE: how to adjust air fuel mixture

On any carburator,one screw is for the idle speed, the other the air/fuel mix.Start the engine and let it get plenty warmed up. Adjust the idle screw to make the engine run slow. Turn the air/fuel screw in until the engine starts to die then out till it starts running loady.You want the screw between these two locations. Adjust it till the engine runs the fastest. Now adjust the idle speed screw to about 1000 RPM.
I hope this helps you.

Posted on Sep 24, 2009

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http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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Nissan Pathfinder Backfires? http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
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When you start the car if you have a stuck open IAC or vacuum hose leak the O2 sensor will see this extra air and add fuel to compensate to maintaim a 14.7 to 1 ratio but also the computer will see your foot is off the gas and the throttle position switch is closed. Under this condition the computer will want a precalibrated RPM which is between 660 to about 750 rpm +or- some. It will close the IAC till it reaches this level.

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Vacuum leaks. Check all hoses and intake bolts. Leaking EGR or plugged PCV valve. Air filter plugged. Leaking head gasket. Worn timing chain. Camshaft lobes worn. Valves burned or leaking. Fuel idle control system or sensor. Good luck!

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